Apparatus for feeding glass charges



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Patented Sept. 27, 1932 UNITED STATES PATENT OFFICE CLYDE NAGLE, OF ELMIRA, NEW YORK, AND CHESTER B. EOOPES, OF THREE RIVERS, TEXAS, ASSIGNORS TO HARTFORD-EMPIRE COMPANY, OF HARTFORD, CONNECTICUT,

A CORPORATION OF DELAWARE APPARATUS FOR FEEDING GLASS CHARGES Application filed September 20, 1929. Serial No. 393,988.

This invention relates generally to the feeding of molten glass in mold charges which are severed while'they are in suspension belowa discharge outlet of a container, and more particularly to glass feeding apparatus for feeding specifically different mold charges in each of repeated series.

An object of the present invention is to improve a reciprocating plunger feeder of a well-known type of construction by applying thereto simple, efficient and reliable mechanism for adapting such feeder to feed regulably controlled mold charges which, for each of successive cycles of an associate formingmachine, may be varied automatically according to the particular requirements of individual molds of such forming machine.

A further object of the invention is the provision of an improved glass feeding apparatus which will afford facilities for feeding in cyclic order mold charges of a plurality of different weights while maintaining the same general shape for all of such charges.

A further object of the invention is the provision'in an improved glass feeding machine having mechanism for effecting the feeding of a plurality of specifically different charges for each of successive cycles of operation of an associate forming machine, of means for controlling the changes between individual charges at the proper times with relation to" the times of presentation of specifically different molds of the forming machine at a charge receiving station to as sure the delivery of appropriate mold charges to the specifically different molds.

A further object of the invention is the provision of a multi-charge controlling mechanism which can be applied to a reciprocating plunger feeder without any substantial change from the usual construction of the latter and without interfering with the operation of such feeder to feed successive mold charges of uniform, regulably controlled shape and weight, when desired.

Other objects and advantages of the invention will become apparent from a consideration of the accompanying drawings and the following specification.

The objects of the invention may be carried out by providing a device which,'when actuated, will be effective to alter the action of the plunger operating mechanism of a recipro-' eating plunger feeder so as to alter incyclic order the glass discharge regulating effect of a reciprocation of the plunger. For example, should one of the molds of a forming machine that is associated with the reciprocating plunger feeder be adapted for the reception of 'a mold charge of greater weight than other molds of that forming machine, the actuating device of the present invention is adapted to be operated at the proper time both with respect to the time of presentation at the charge receiving station of the mold for the heavier charge and to the time of the plunger reciprocation for controlling the formation of that charge, to alter the action of the plunger operating mechanism so that an added lift will be given to the plunger to increase the length of its upstroke during that reciprocation with a consequent increase of weight of the mold charge as required for the relatively largemold. The aforesaid actuating means for altering the action of the plunger operating mechanism may be maintained inactive when desired so that the successive operations of the plunger will be uniform or may be adjusted and appropriately timed to alter a pie-selected cycle of reciprocation of the plunger to effect a regulable change of weight of a mold charge without any material change of shape or a change of shape of'the moldvcharge without substantial change of weight or for changing both the weight and shape of the mold charge.

The invention 'is capable of use with either an intermittently or continuously moving forming machine. In order that control of the operation of the actuating device may not be interrupted or impaired by a dwell in the movement of the-associate forming machine when the operation of the latter is intermittent, the invention may provide combination control means; including a final control member, responsive to an operating movement of the feeder, and a primary control member, responsive to a movement of the mold table at a time adjustable according to the position thereon of a particular mold, to render the final control means. effective when actuated from the feeder to cause the actuating mechanism to effect a change of plunger action as ogand required for the formation of a mold charge altered to fit that particular mold. Pneumatic pressure and pressure operated parts may be employed in carrying out the objects of the invention. A valve, responsive to movement of an operating part of thefeeder,

and a second valve, responsive to an operating movement of the associate forming machine to render the first valve effective when actuated by the feeder, may be employed to control the pneumatically operated movements of the charge altering mechanism of the present invention. A more simple valve" partially in section, showing particularly the plunger operating mechanism, as it appears when viewed from the side thereof opposite to that shown in Fig. 1;

Fig. 3 is an enlarged view, partially in vertical section, of a fragment ofthe apparatus, showing more specifically the pressure cylinder and associate parts which the invention may provide for altering a compound lever of the plunger operatingmechanism;

Fig. 4 is a View in elevation, partially sectional and with parts broken away and omitted, taken on the lines IVIV in Fig. 2;

- Fig. 5 is a vertical section of a timing valve for controlling the application and exhaust of pressure fluid to and from the cylinder of Fig. 3;

ig. 6 is a vertical section of a valve for controlling the timing valve shown in Fig.

F1 7 is a view similar to Fig. 6 but showing tie controlling valve modified for direct connection with the cylinder of Fig. 3.

While the hereinafter described mechanism is preferably applied to a feeder known in the art as the Hartford Single Feeder, a

disclosure of one type of which may be found.

in the United States Patent No. 1,596,438, granted August 17, 1926, to Edward H. Lorenz, it may equally well be applied to other feeders by those skilled in the art. Inas- 1 much as the hereinafter described practical embodiment of the invention is illustrated in the drawings as applied to a feeder of that! type, a description of the parts of the feeder with which the present invention cooperates will now be given.

Referrin to the drawings (Figs. 1 and 2), a lass %eeding forehearth is indicated at 11. plunger 13 depends in the forehearth .the plunger carrying arm 14 by the mechanisms generally indicated at 18 and 19. Means for reciprocating the plunger 13 includes-a cam 20 mounted on a drive shaft 21 (Figs. 1 and 4) driven by a worm 22 which meshes with a worm gear 23, secured to the shaft 21. A cam roll 24 (Fig. 2) is mounted on an arm 25, which in turn is mounted on an eccentric pivot 26. The cam roll 24 is connected by a link 27 with a pivot 28 at one end of an arm 29, said arm 29 being mounted on a pivot 30. The pivot 28 is connected by a link 31 with a pivot 32, which pivot may be adjusted by means of a screw 36' along a slot 33 in one of the members 34 of a compound lever 35. The compound lever comprises,,in addition to the member 34, a member 37, both of said lever members being pivoted on the pivot 38. One end of the member 37 is connected with the bracket 15 by a link 39, whereby each oscillation of the member 37 will cause a reciprocation of the plunger 13. A pair of shear blades, designated 40, are actuated by acam 41 through a motion transmitting mechanism including the lever 42. Any suitable known operating connections may be provided between the 1 lever 42 and the shear blades 40. Such operating connections may be similar to those which are disclosed in United States Patent No. 1,760,435, granted May 27, 1930, to Karl E. Peiler. The shear cam 41 is mounted on the same shaft 21 as the plunger cam 20 and consequently its .rotation is synchronized with the rotation of the plunger cam. The cam roll 24 may be moved around the periphery of the cam 20 by means of a worm 43 having a hand wheel 43a, and a worm gear 44, which together may be employed when desired to rotate the eccentric pivot 26.

Driven through a chain of gears 100 (Fig. 4) from the shaft 21 is a valve 101 which may control the movement of a mold table 98 so that the mold table is moved in synchronism with the movement of the shaft 21 and therefore with the movement of the plunger 13 and tit) ' justing screw 48.

amples of mechanisms suitable for operating the ,delivery chute or a section thereof un-' der the control of a valve, such as the valve 101, are disclosed in Patent No. 1,637,452, granted August 2, 1927, to E. G. Nelson, Jr., and in British Patent 203,858, accepted September 20, 1923, to Pleukharp and Raynes.

In the operationof a feeder such as partly described, successive cycles of operation of the plunger operating means will cause similar reciprocations of the plunger between limits which are predetermined by adjustments of the plunger operating mechanism, the speed of movement of the plunger being governed by the contour of the cam 20. Thus,

mold charges of uniform but adjustable shape and weight may be formed in suspension below the' discharge outlet and are severed when formed by the periodically op-. erating shears 40.

The illustrated embodiment of the present invention comprises a fluid pressure cylinder at suitably timed intervals with the main to vary the length of the stroke of the plunger,

also the speed of a portion of the stroke of the plunger may be varied. A valve 57, 5, controls the admission and exhaust of operating pressure fluid toand from the cylinder 45. A cam 51, preferably operated by a rotating part of the feeder operating meeha nism, supplements the action of a periodically operated valve 81 to control the o erations of the valve 57. The valve 81 pre erably is actuated in response to an operating movement of the associate forming. machine and serves to render the feeder actuated movements of the valve 57 effective to control the time of operation of the fluid pressure/actuated means for altering the lengtlgpf the stroke of the glass discharge regulating plunger. Thus, the alteration of such plunger stroke may be effected at the desired time, even though the associate forming machine be of the intermittent type and be stationary at the beginning or during part of such altera- 'tion.

mounted on the upturned free end 37 a of the member 37 of the compound lever of the plunger operating mechanism. A sleeve 46 extends axially through the cylinder and is mounted to slide through suitable openings in the cylinder heads, which openings may be packed in. any suitable known manner to prevent leakage .of pressure fluid. Suitably secured around the sleeve 46 is an annular piston 47 that is adapted to be reciprocated within the cylinder 45. The sleeve 46 is internally screw-threaded for engagement with an ad- The lower end portion of the screw 48 protrudes from the lower end of the sleeve 46 and bears against the upturned free end portion 34a of the member 34 of the The pressure cylinder 45, (Fig. 3), is-

aforesaid compound lever. The up er end portion of the adjusting screw protru es from the upper end of the sleeve and carries a hand wheel 48a. N-earits upper end the sleeve 46 ise'xternally threaded andcarries a nut 50 which serves as a stop member to limit the downward movement of the screw 48 as it is carried downward by the piston 47. A key 4611 carried by the lower cylinder head projects into a longitudinal groove 46?) in the sleeve 46 and prevents the latter from turning in the cylinder.

A pipe 49 connects the valve 57 with the space in the cylinder 45 above the piston 47, whereby when fluid under pressure is ad-[: mitted to such space, the piston 47, the sleeve 46, and the screw 48 are moved downward as a unit. The pressure thus exerted on the end portion 34a of the lever member 34 will swing the lever member 37 angularly about the pivot 38 independently of the lever member 34,

1 causing an added lift of the plunger 13. 45 and associated parts adapted to cooperate Y The normal'or inactive position of the piston 47 may be said to be thatshown in Fig. 3. In this position of the piston, the adjusting screw 48 controls the angular relation with respect to each other of the members 34 and 37' of the compound lever 35. Adjustment of the angular relation between-these lever members to change the position of the path of the cam actuated reciprocations of the plunger 13 may be effected by adjusting the screw 48. This corresponds to a like adjustment which may be made in the operating mechanism of a, reciprocating plunger feeder of the type hereinbefore described.

When air under pressure is supplied to th cylinder 45 through the pipe 49, the consequent swinging movement of the lever member 37 independently of the cam-actuated swinging movement thereof will cause an added lift on the plunger 13. If this added lift be timedto commence and terminate dur ing the cam-actuated upward movement of the plunger, the speed of a portion of the upstroke of the plunger may be altered and the upper limit of the plunger stroke also'may be raised. The added lift may be timed to terminate after the upper limit of the camactuated stroke of the plunger has been reached, in which event the length of the up stroke may be increased and the upper limit of such stroke raised without changing the speed of any substantial portion of the camactuated upstroke. The extent of the increase of the length of the upstroke of the plunger may be varied by adjustment of the nut 50 or by variation of the time of beginning of the downward movement of the piston 47 with respect to the time of ending of the cam release of ressure from the space above the piston. T is release may be timed to occur shortly after the added lift has been given to the plunger at the upper end of its stroke and before the normal cam-controlled downstroke of the plunger has commenced. Such. timing of the added lift of the plunger and of the release of the pressure from the upper part of the cylinder may be employed to increase the weight of a given mold charge of each of successive series of mold charges without a substantial change of shape of such mold I charge.

It will be understood that by selective timing of the application and release of pressure ment of the plunger independently of control of the cam 20 may be timed to take place between the normal upper and lower limits of the plunger downstroke: This will occasion a change of speed of part of the downstroke. A change of speed of a lower portion of either the downstroke or of the upstroke or of both such strokes may be em-- ployed tochange the shape of the resultant mold charge either with or without material.

change of weight. Moreover, it is within the purview of the invention to retard, stop, or even reverse the movement of the plunger during a portion of its upstroke or downstroke by timing the release of the pressure from the upper end of the cylinder to occur during the cam-actuated. upstroke of the plunger or the application of the pressure. to

the upper part of the cylinder to be effected during the cam-controlled downstroke of, the plunger.

It also is within the purview ofthe inven tion to reverse the cycle of movements of the piston 47 so that the normal position of the latter is at the bottom of the cylinder 45. Release of pressure from the upper part of the cylinder 45 during a downstroke of the plunger followed by application of pressure to the cylinder during the upstroke then would be effective to change the length of the plunger reciprocation by lowering the lower limit thereof without raising the upper limit. This arrangement might well be employed to produce a decided variation of shape. of a 'charge without material change of weight.

Mechanism which may be employed to time.

and control the application and release of pressure to and from the cylinder 45 will now be described. I

The cam 51, hereinbefore referred to as in cluded in such timing and control mechanism, may be mounted on the feeder drive shaft 21 for adjustment-angularly' above the axis of said shaft. This cam may have a projecting lobe 52. A cam roller 53 carriedby-an arm 54 is p'ivotally mounted at55- on the frame of the feeder mechanism. A spring 56 urges the arm upward and maintains the cam roller 53 in contact with the cam 51. Beneath the free endportion of the arm 54 and mounted on a portion of the feeder framework or other convenient support is the timing valve 57. I

The timing valve 57, shown in detail in Fig. 5, may comprise a cylindrical casing 58,

a sleeve valve 59, and an inner piston valve 60.

The piston valve 60 has a piston rod 60a upon the upper end of which is mounted a cam roller 76 with which the arm 54 will contact when the cam roller 53 is in contact with the cam lobe 52. On one side of the casing-58 is provided a port 61 from which-a pipe 49 leads to butlongitudinally spaced therefrom, are two ports 64 and 65 placed respectively at the upper and lower ends of the casing. These ports are adapted to receive the pipes 66 and 67 respectively. Both of the pipes 66 and 67 are connected with the pilot or control valve 81, hereinbefore mentioned. The sleeve valve 59 is provided with aligned transverse bores 68 and 69 adapted to be" brought into registration with the ports 61 and 62, respectively when the sleeve valve is at the upper endof its stroke in the casing 58. The piston valve 60 has an annular groove 70 adapted to be brought into communication with the bores 68 and 69'when the piston valve is at the lower end of its stroke in the sleeve valve 59. The sleeve 59 has another radial bore 71 adapted to be brought into registration with the port 61 when the valve sleeve is at the lower end of its stroke in the casing 58. The piston valve 60 has a radial bore 72 and a longitudinal bore 73 connected therewith, the bore 72 being adapted to be brought into registration with the bore 71 when the piston valve is at the upper end of its stroke in the sleeve valve.

The bore 73 leads to the atmosphere. An

expansion spring 74 is disposed between the lower end of the piston valve and a cap on the lower end of the sleeve valve and urges the piston valve toward the upper end of the sleeve valve. The sleeve valve and the piston valve are prevented from turning relatively to'each other and to the casing 58 by guide pins 7 8 and 77, carried by the casing and respectively projecting into longitudinal grooves 80 and 7 9 in the sleevevalve and the piston valve stem, respectively.

The pilot or control valve 81 (Figs. 1 and portions.

6) comprises a casing 82 and a piston valve 83 adpated to move within said casing. Ports 84 and 85 in the casing 82 are spaced longitudinally thereof. These ports respectively are connected by the pipes 66 and 67 with the upper and lower ends of the timing valve casing 58. At the side of the easing 82 opposite from the ports 84 and 85 and spaced approximately midway between such ports is a port 86 for the reception of a pipe .87 which leads to a source of pressure fluid supply (not shown). The casing 82, at the same side as the port 86, has ports 88 and 89, which respectively are located adjacent to the opposite ends of the casing 82, the port 88 being located nearer to the upper end of the casing 82 than the port 85 and the port 89 being located nearer to the lower end of the casing 82 than the port 84. The ports88 and 89 lead to the atmosphere. The valve 83 has enlarged portions 90, 91 and 92 fitting the bore of the casing 82 closely but slidably, thus providing annular grooves 90a and 90b on the valve between saidenlarged 90a will serve as an exhaust connectionbetween the pipe 67 and the port 88. The spring 94 bears against a head 93 on the slide valve 83 and tends to maintain the slide valve in its upper or raised position. The upper position of the slide member is adjustable by means of a screw 95 which limits the upward movement of the slide member. The head 93 of the slide valve may carrya cam roll 96 for engaging with the aforesaid cam 97. The latter may be carried by the rotary mold table 98 of the associate; forming'machine. Asbest seen in Fig. 1, the cam 97 preferably is secured to the mold table, as by the construction indicated at 98a, so that the cam can be adjusted around the periphery The operating movements of the inold' table 98 and of the parts of the feeder which control the formation and the'delivery of the mold charges are synchronized so that a' mold The groove 90a will establish" 99 on the mold table will be positioned at the proper place to receive each charge as it is delivered by the feeder. Figure 4 illustrates a train of ge'aring 100 connecting the cam shaft 21 with a shaft or other operating part for controlling the operations of a timing valve 101 for initiating or controlling the operations of the mold table. Any other suitable known synchronizing mechanism may be employed between the feeder and the mold table. The mold charges when formed and severed may be delivered to the molds at the charge receivingstation in any suitable known manner, as by means of the delivery trough indicated at 102 in Fig. 1.

The discharge of molten glass through the outlet into suspension therebelow ,-will be regulated by the reciprocating plunger 13. For convenience of explanation, it will be assumed that one of the molds 99 on the mold table is adapted to receive a charge of greaterweight than the remaining molds on that mold table. The spring 94 of the primary control valve 81 tends to hold the slide member of that valve raised so that fluid pressure from the supply pipe 87 will pass through the pipe 66 to the upper part of the timing valve 57, thus maintaining the sleeve valve 59 in the latter in its lower position in the valve casing 58. At this time, the pipe 67 leading from the lower part of the valve casing 58 will be in communication with the atmosphere through the upper part of the valve casing 82 and the vent port 88. The spring 74 at the lower end of the piston valve 60 will tend to maintain the piston valve at the upper endof its stroke in'the sleeve 59 so that the upper part of the cylinder will be in communication through the pipe 49, radial passage 71 in the sleeve valve, radial passage 72 in the piston valve and longitudinal bore 73 of the piston valve with the atmosphere. The piston 47 thus will remain at the upper end of the cylinder 45 and so long as this condition obtains, the successive reciproeations of the plunger 13 will be the same. However, to produce the relatively heavier charge for the larger mold during each cycle of rotation of the mold table 98, the. cam lug 97 is so disposed on the mold table with respect to that mold that the slide member 83 will be depressed in the valve casing 82, to the position shown in Fig. 6, at a preselected time whereupon the pressure will be exhausted from the upper part of the valve casing 58 through the lower part of the valve casing 82 and fluid pressure will be applied from the supply pipe 87 through the pipe 67 to the lower part of the valve casing 58, thereby raising the sleeve valve 59 to the position shown in Fig. 5. The cam lobe 52 of the cam -51 will strike the arm 54 at the proper time in the cycle of the charge for-m ingoperations of the feeder and will cause downward movement of the piston valve plunger 13 may be timed to occur about the time that the normal cam actuated upstroke of the plunger would cease so that the upper limit of the upstroke will be raised and consequently moreglass for the succeeding mold charge will be permitted to pass through the discharge outlet into suspension therebelow. The release of the pressure fluid from the upper part of the cylinder and the consequent downward movement of the plunger independently of the normal cam controlled downward movement thereof may take place as soon as the additional lift has been given to the plunger. Such release will be effected as soon as the cam lug 97 has disengaged the cam roller 96 at the upper end of the slide member 83 of the primary control valve and the cam lobe 52 of the cam5'1 has moved out of engagement with the arm 54. The slide member 83 then will be permitted'to move to its upward position to release the pressure from the,lower part of the valve casing 58 and to cause application of fluid under pressure to the upper part of the valve casing 58 while the piston valve 60 will be permitted to move upward relatively to the sleeve 59 to align the radial passage 7 2 of the piston valve with the radial passage 71 of the sleeve valve.

Consequently, when the sleeve valve 59-and the piston valve 60 move downward as a unit,

' the aligned passages 71 and 72 will register with the passage 61 and pressure fluid .will be released from the upper part of the cylinder 45 through the pipe 49 and the v alve 57. The shears 40 will sever the relatively heavier mold charge at the proper time for delivery to the relatively larger mold at the charge receiving station. With this arrangement, the mold table 98 may be of the intermittently rotating type, the cam lug 97 being appropriately positioned to effect the raising of the sleeve valve 59 before a periodof dwellof the mold table commences and the cam 51 on the 4 shaft 21 of the feeder then controlling the time at which the valve 57 is rendered eflec tive to apply the pressure fluid to the upper part of the cylinder 45.

Should the rotation of the mold table 98 be continuous, the valve 57, which may be termed the secondary control valve, and its connections with the valve 81 and with the cylinder 45 may be dispensed with and the pipe 67 of of the valve 81 may be connected directly part of the cylinder 45. When the slide member 83 has been released, the upward movement thereof by the spring 94 will close the connection betweenthe pipes 87 and 67 and will open the connection between the pipes 67 and the vent port 88 so that air pressure will be released from the upper part of the cylinder 45. The cam for periodically actuating the slide member 83 of the valve 81 may be the cam lug 97 on the rotating mold table I when the rotation of the mold table is continuous, the same as when the rotary movements of the mold table are intermittent, although it is obvious that the valve 81 might be disposed adjacent to a suitable cam on a rotating part of the feeder, as for example the cam 51, so that the operations of the valve 81 may be controlled directly from the feeder, it being assumed of course that the feeder operations and the movements of the continuously rotating mold table are properly synchronized. However, actuation of the valve 81 by a member that is carried adjustably by the mold table permits convenient adjustment of the position of the valve actuating cam according to the position of the mold to which an altered charge is to be sup-- plied, which position may vary according to particular requirements or service conditions.

It also is to be understood that the hereinbefore described mechanism for altering a reciprocation of the plunger 13 may be actuated as required to produce more than one of the relatively heavier or otherwise varied mold 7 charges for each cycle of rotation of the mold table. In that event, a cam lug 97 will be provided for each of the molds, the charge for which is to be varied, and each lug 97 will be secured on the mold table in the proper position with respect to the associate mold to effect the desired alteration of the plunger reciprocation for the regulation of the glass discharge for that particular mold charge. 7

While the operations of a practical embodiment of the invention have been dehit llll The various features of the invention may be modified and varied as to combination, construction and operation to adapt them for particular conditions of service or uses without departing from the spirit and .scope'of the invention, as set out in the appended claims.

l Ve claim:

1. In a glass feeding apparatus, the combination with a container having a submerged glass discharge outlet, of an implement movable toward and from the outlet to control the discharge of glass through the outlet, means for operating said implement and automatically acting fluid pressure actuated means for altering the speed of a predetermined movement of the implement.

2. In apparatus for feeding a series of mold charges from a mass of molten glass in a container having a submerged outlet, the combination of a plunger movable vertically toward and from the outlet to control the discharge of glass therefrom, means for reciprocating the plunger with a stroke of a predetermined length, and pneumatic means for automatically increasing the, length of "the stroke of the plunger for one of a series of successive reciprocations thereof beyond the limit of movement of the plunger by the plunger reciprocating means alone.

3. In apparatus for feeding mold charges from a mass of molten glass in a container having a submerged outlet, the combination of a plunger movable vertically toward and from the outlet to control the discharge of glass therefrom, means for causing a plurality of successive cycles of operating movements of the plunger in each of recurring series and pneumatic means for automatically altering the rate, of movement of the plunger during part of one of said cycles in each of said series.

4. In apparatus for feeding mold charges from a mass of molten glass in a container having a submerged outlet, thd combination of a plunger movable vertically toward and from theoutlet to control the discharge of glass therefrom, means for operating the plunger in a plurality of successive regular cycles, in each of recurring series and pneumatic means for automatically increasing the speed of the plunger during part of one of saidcycles in each of said series.

5. In apparatus for feeding glass in mold charges, a container having a submerged out let for the discharge of molten glass for said charges, a plunger reciprocable in said container towardand from the outlet, and means for reciprocating said plunger and for varying in cyclic order the size of the charges fed, said means comprising a drive member linkage arranged between the drive member and the plunger and'including acompound lever and a fluid pressure operating device interposed between parts of the compound lever.

6. In apparatus for feeding glass in mold charges to a forming'machine, the combination with'a container having a submerged discharge outlet and a plunger reciprocable in the container in working alignment 'with the outlet, of a drive member, linkage between the drive member and the plunger, a compound lever included in said linkage, a pressure cylinder and piston device interposedbetween parts of the compound lever and adapted, when actuated, to alter said linkage, and means coordinated with the movements of an operating part of said feeder for timing the operations of said pressure device.

7. In apparatus for feeding glass in mold charges to a forming machine, the combination With a container having a submerged glass discharge outlet and a plunger reciprocable in the container toward and from the outlet, of means for reciprocating the plun er to vary automatically in cyclic order tl e charges fed, said means comprising a drive member, linkage between the drive member and the plunger, a compound lever included in said linkage, a pneumatically operated device interposed between parts of the compound lever, and operable to actuate said linkage for altering anoperating movement of said plunger independently of the action of said drive member, and'valve means for controlling the operations of said pneumatically operated device.

8. In apparatus for feeding glass in mold charges to a 'formingvmachine, the combination with a container having a submerged outlot and a plunger reciprocable in the container toward and from the outlet, of means for varying in cyclic order the charges fed, said ,means comprising a drive member, linkage mechanism including a compound lever for reciprocating said plunger to regulate the discharge of glass for each mold charge, a plurality of independently operable devices for altering the relation between component parts of said compound lever, and automatic means for periodically operating one of said devices.

in'mold charges having a plunger reciprocablein a container toward and from a discharge outlet of the container, means for reciprocating the plunger and for varying au- 10. In apparatus for feeding molten glass tomatically in a cyclic order the charges fed, said means comprising a drive member, linkage from the drive member to the plunger, a compound lever included in said linkage, a

- -pressure cylinder carried by one arm of said lever, a' piston movable in the cylinder and having a piston rod bearing on another part of the compound lever, a valve for controlling application and exhaust of pressure fluid to and from the pressure cylinder, said valve comprising a' vertically disposed casing, a sleeve within the casing, a piston within the sleeve, the said sleeve andpiston both having ports adapted to be aligned with ports in the casing when the piston is depressed and the sleeve is raised, an adjustable cam adapted to depress the piston, and a pilot valve, actuated by an associate forming machine, adapted to supply pressure alternately to ends of the sleeve to elfect movement of the piston into and out of operative relationship with the cam.

11. In apparatus for feeding molten glass in mold charges to a forming machine, a

container having a discharge outlet for molten glass, a plunger reciprocable in the container in working alignment with the outlet to control the discharge of glass for each mold charge, a drive member, linkage from the drive member to the plunger, a compound lever included in said linkage, a pressure cylinder carried by one arm of said lever, a piston movable in said cylinder and having a piston rod bearing on another part of the compound lever, and a valve actuated by said forming machine for controlling the application of pressure to and release of pressure from the pressure cylinder.

Signed at Three Rivers, Texas, this 12 day of September, 1929.

CHESTER B. HOOPES. Signed at Elmira, N. Y., this 6th day of September, 1929.

CLYDE NAGLE. 

